ELECTRICAL SUPPLY UNIT (ESU) INSPECTION

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1.  Remove the front scuff plate.(LH) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

2.  Remove the front side trim.(LH) (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

3.  Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference). (See Terminal Voltage Table (Reference).)

•  If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.

―  If the system does not work normally even though the inspection items are normal, identify the malfunctioning location according to the directions in [DIAGNOSTIC SYSTEM] and [SYMPTOM TROUBLESHOOTING] then perform repairs.

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Terminal Voltage Table (Reference)

Terminal	Signal	Connected to	Measurement condition		Voltage (V)	Inspection item(s)
1A	Ground	Body ground	Under any condition		1.0 or less	Body ground
1B*1	Door unlock control	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)	Driver's door lock switch is unlocked		1.0 or less → Approx. 10 → 1.0 or less	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)
			Conditions other than above		1.0 or less
1C*1	Door lock control	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)	Driver's door lock switch is locked		1.0 or less → Approx. 10 → 1.0 or less	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)
			Conditions other than above		1.0 or less
1D	Taillight, license plate light control	•  License plate light (LH), (RH) •  Taillight (LH)	Ignition is switched ON (engine off or on)	Light switch is in TNS position	B+	•  License plate light (LH), (RH) •  Taillight (LH)
				Light switch is in OFF position	1.0 or less
1E*1	Double locking system control	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)	Press remote transmitter lock button two times (double locking system operation condition)		1.0 or less → Approx. 10 → 1.0 or less	•  Front door latch and lock actuator (LH), (RH) •  Rear door latch and lock actuator (LH), (RH)
			Conditions other than above		1.0 or less
1F	—	—	—		—	—
1G	E latch motor control	•  Liftgate latch and lock actuator (5HB) •  Trunk lid latch and lock actuator (4SD)	•  Liftgate is open (5HB) •  Trunk is open (4SD)		1.0 or less → Approx. 10 → 1.0 or less	•  Liftgate latch and lock actuator (5HB) •  Trunk lid latch and lock actuator (4SD)
			•  Liftgate is close (5HB) •  Trunk is close (4SD)		1.0 or less
1H	Ignition power supply	METER1 10 A fuse	Ignition is switched ON (engine off or on)		B+	METER1 10 A fuse
			The ignition is switched off (LOCK)		1.0 or less
2A	Taillight control	Taillight (RH)	Ignition is switched ON (engine off or on)	Light switch is in TNS position	B+	Taillight (RH)
				Light switch is in OFF position	1.0 or less
2B	Power supply	TAIL 20 A fuse	Under any condition		B+	TAIL 20 A fuse
2C*2	Rear fog light relay control	Rear fog light	Ignition is switched ON (engine off or on)	Rear fog light switch is on	B+	Rear fog light
				Rear fog light switch is off	1.0 or less
2D	Interior illumination power supply	•  Steering switch •  Commander switch*3 •  DVD/CD player*4 •  Audio unit*5 •  Hazard warning switch •  Climate control unit •  Shift panel (indicator) •  Drive selection switch*6 •  Cruise control switch	Ignition is switched ON (engine off or on)	Light switch is in ON position	B+	•  Steering switch •  Commander switch*3 •  DVD/CD player*4 •  Audio unit*5 •  Hazard warning switch •  Climate control unit •  Shift panel (indicator) •  Drive selection switch*6 •  Cruise control switch
				Light switch is in OFF position	Voltage changes according to the tester specification, therefore determination is not possible.
2E	Rear wiper motor control	Rear wiper motor	Ignition is switched ON (engine off or on)	Rear wiper switch is on	1.0 or less	Rear wiper motor
				Rear wiper switch is off	B+
2F	Cargo compartment light power supply	•  Cargo compartment light (5HB) •  Trunk compartmenr light (4SD)	•  Ignition is switched ON (engine off or on) and cargo compartment light switched on (5HB) •  Ignition is switched ON (engine off or on) and trunk compartment light switched on (4SD)	•  Liftgate is opened (5HB) •  Trunk is opened (5HB)	1.0 or less	•  Cargo compartment light (5HB) •  Trunk compartmenr light (4SD)
				•  Liftgate is closed (5HB) •  Trunk is closed (5HB)	B+
2G	Ground	Body ground	Under any condition		1.0 or less	Body ground
2H	Serial communication	SAS control module	Terminal used for communication therefore determination based on terminal voltage is not possible.
2I	LIN communication	Body control module (BCM)	Terminal used for communication therefore determination based on terminal voltage is not possible.
2J	—	—	—		—	—
2K	—	—	—		—	—
2L	Front map light power supply	Front map light	Ignition is switched ON (engine off or on)	Interior light switch is in DOOR position and door is open	1.0 or less	Front map light
				Interior light switch is in DOOR position and door is closed	B+
2M	Rear wiper motor power supply	Rear wiper motor	Ignition is switched ON (engine off or on)	Rear wiper switch is on	B+	Rear wiper motor
			The ignition is switched off (LOCK)	Rear wiper switch is off	1.0 or less
2N	—	—	—		—	—
2O	—	—	—		—	—
2P	Power supply	•  INTERIOR 15 A fuse •  ROOM 25 A fuse	Under any condition		B+	•  INTERIOR 15 A fuse •  ROOM 25 A fuse
2Q	Back-up light control	Back-up light (LH), (RH)	Ignition is switched ON (engine off or on)	Selector lever is in R position	B+	Back-up light (LH), (RH)
				Conditions other than above	1.0 or less
2R	Power supply	•  R.WIPER 15 A fuse •  CABIN+B 50 A fuse	Under any condition		B+	•  R.WIPER 15 A fuse •  CABIN+B 50 A fuse
3A	Headlight high-beam control	Front combination light (RH)	Ignition is switched ON (engine off or on)	Light switch is in high-beam position	B+	Front combination light (RH)
				Light switch is in position other than high-beam position	1.0 or less
3B	Power supply	H/L RH 20 A fuse	Under any condition		B+	H/L RH 20 A fuse
3C	Headlight low-beam control	Front combination light (RH)	Ignition is switched ON (engine off or on)	Light switch is in low-beam position	B+	Front combination light (RH)
				Light switch in OFF position	1.0 or less
3D*1	Power supply	D.LOCK 25 A fuse	Under any condition		B+	D.LOCK 25 A fuse
4A	Headlight high-beam control	Front combination light (LH)	Ignition is switched ON (engine off or on)	Light switch is in high-beam position	B+	Front combination light (LH)
				Light switch is in position other than high-beam position	1.0 or less
4B	Front washer motor control	Washer motor	Ignition is switched ON (engine off or on)	Front washer switch is on	B+	Windshield wiper motor
				Front washer switch is off	1.0 or less
4C	Power supply	H/L LH 20 A fuse	Under any condition		B+	H/L LH 20 A fuse
4D	—	—	—		—	—
4E	Headlight low-beam control	Front combination light (LH)	Ignition is switched ON (engine off or on)	Light switch is in low-beam position	B+	Front combination light (LH)
				Light switch in OFF position	1.0 or less
4F	—	—	—		—	—
4G	Parking light (RH) control	Front combination light (RH)	Ignition is switched ON (engine off or on)	Light switch is in parking light position	B+	Front combination light (RH)
				Light switch is in position other than parking light position	1.0 or less
4H	Rear washer motor control	Washer motor	Ignition is switched ON (engine off or on)	Rear washer switch is on	B+	Washer motor
				Rear washer switch is off	1.0 or less
4I	Parking light (LH) control	Front combination light (LH)	Ignition is switched ON (engine off or on)	Light switch is in parking light position	B+	Front combination light (LH)
				Light switch is in position other than parking light position	1.0 or less
4J*7	Running light control	Running light (LH), (RH)	Ignition is switched ON (engine off or on)	Running light illuminates	B+	Running light (LH), (RH)
				Running light turns off	1.0 or less